Mark Hsu, MD
NPI 1851616486 · Urology Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hsu, MD is a Urology Physician provider in Fremont, CA (NPI 1851616486).
Provider details
- NPI number
- 1851616486
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A117893 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,484 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 542 | $109 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 447 | $19 |
| Automated Urinalysis Test81003 | 325 | $2 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 318 | $153 |
| Ultrasound Measurement of Bladder Capacity After Voiding51798 | 197 | $16 |
| Diagnostic Exam of Bladder and Urethra Using an Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 304 | 126 |
| Finasteride | 249 | 101 |
| Mirabegronbrand: Myrbetriq | 128 | 33 |
| Doxazosin Mesylate | 125 | 40 |
| Cephalexin | 57 | 40 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 36 | 31 |
| Estradiol | 35 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$429 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1541 Florida AveSuite 100Modesto, CA 95350-4429Phone: (209) 577-3388
Registry dates
- Enumerated
- 2010-04-07
- Last updated
- 2019-03-18
Frequently asked questions
- What is Mark Hsu's NPI number?
- Mark Hsu's National Provider Identifier (NPI) is 1851616486, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hsu's specialty?
- Mark Hsu is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Hsu located?
- Mark Hsu's practice location on file with NPPES is 39141 Civic Center Dr Ste 335, Fremont, CA 94538-5878.
- What is Mark Hsu's phone number?
- The practice phone number listed in the NPPES registry for Mark Hsu is (510) 248-1414.
- Does Mark Hsu accept Medicare?
- Mark Hsu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hsu's NPI active?
- Yes — Mark Hsu's NPI (1851616486) is active in the NPPES registry as of the last update on 2019-03-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.